Improvement in coal-screens



NITED STATES PATENT OFFICE.

JASPER SNELL AND JOHN R. DEIHM, OF POTTSVILLE, PENNSYLVANIA.

IMPROVEMENT IN COAL-SCREENS.

Specification forming part of Letters Patent No. 33,268, dated September10, 1861.

To a/ZZ whom it may concern:

Be it known that we, JASPER SNELL and J oHN R. DEIHM, of Pottsville,Schuylkill county, and State of Pennsylvania, have invented a new anduseful Improved Coal- Screen; and we do hereby declaret-hat thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings, and to the letters of reference markedthereon,in which the like letters refer to the same parts. p

Figure l. is a side elevation. Fig. 2 is a section of one of the rings.Fig. 3 is the ring in section through its center.

To enable others skilled in the art to make and use our invention,wewill describe its construction and operation.

In the construction of our invention we use any material best adapted tothat purpose which we may prefer. The screenis formed into 'a cylindercomposed of rings A, with spaces b between the rings A in which teeth cof the combBoperate to prevent said spaces l) from being choked orfilled up by the refuse which passes out at said openings. This cyliuderA is attached to a shaft C by means of uraces D, attached to each ringA. These braces extend across the inner portion of the rings and have aneye inthe center to slip `on the shaft C. When thus constructed, we

form a cylinder of any length or diameter we desire. It will be seenthat the outer surfaces of the rings are conical, tapering from thefront end to the rear, making the baseof the cone `the front end of thering, while the inner surfaces of the rings are beveled, being madeconical from the points where the braces are attached` to the rings,having the wide end or base of the inner cone tothe front end of themachine, thus allowing the slate, stone, and other refuse to escape fromthe screen reversely from where the coal escapes. The braces supportingthe rings are slipped onto the shaft and keyed in any desirable way, soas 'to make them fast andilnmovable on the shaft. When the cylinder isthus completed,

it is hung to the frame E, with the bearings F slightly incliningdownward at the discharge end of the cylinder, where the coal is letoff, and the openings between the rings where the slate and stone aredischarged are lower than the inner ridge'of said rings, so

that while the coal will pass over these ridges down through the wholelength of the cylinder, the slate and stone, being thinner, will ndtheir way out between the rings and discharge reversely from the coal.The comb B, which .is firmly attached to the cross-bar of frame E, hasteeth c fitting into the openings b between the rings, and as thecylinder revolves these teeth c completely comb these spaces at everyrevolution of the cylinder, thus keeping said spaces open.

G is a guide to direct the coal into the cylinder, andthe ring e on thefront ring is to prevent the coal from falling out of the cyl- .inder asit revolves. The cylinder A may be made smaller.

In the operation of our invention the cylinder is put in motion by meansot' any power` attached to the crank in any ordinary way. The coalenters at the front end, which is slightly elevated, and as it revolvesthe coal by its gravity works to the rear end to. be discharged; but theelevations on the inside and rear ends of the rings give to the coal alifting upward motion, tending to separate it from the thinslate andstone and refuse particles when they fall on the reverse incline planeof each ring and give to them a reverse motion as the cylinder revolves,vcausing them to pass out of the cylinder at each opening between therings, thus continuing the operation of separating the coal th rough theentire length of the cylinder.

Having thus described the construction and operation of our invention,what we claim as new, and desire to secure by Letters Patent,

l. The revolving cylinder made of sections or rings A, with spaces bbetween said rings, operating as set forth, and for the purposesdescribed.

2. The comb B, with teeth o, operating in the continuous spaces hbetween the rings A of the revolving cylinder, for the purposes setforth.

JASPER SNELL. JOI-IN R. DEH-IM.

lVitnesses:

JAMES H. FIsTEn,

JACOB REED.

made conical by each consecutive ring being`

